Abstract # 13098 Event # 129:

Scheduled for Friday, August 10, 2018 11:00 AM-11:15 AM: (Chula Vista ) Oral Presentation


L. A. Isbell1,2,3, L. R. Bidner1,3, E. K. Van Cleave2, A. Matsumoto-Oda3,4 and M. C. Crofoot1,2,3,5
1Department of Anthropology, University of California, Davis, CA 95616, USA, 2Animal Behavior Graduate Group, University of California, Davis, 3Mpala Research Centre, Kenya, 4Graduate School of Tourism Sciences, University of the Ryukyus, Okinawa, Japan, 5Smithsonian Tropical Research Institute, Balboa, Ancon, Panama
     Predation is thought to be a major selective pressure on primate behavior, especially for Old World savannah-woodland primates because they are often terrestrial and co-occur with several large felid species. Their relationships with such predators are still not well understood, however, because felids tend to avoid human observers, which may lead to inaccurate assessments of predation's effects. We overcame this limitation by remotely tracking six olive baboons (Papio anubis) in four groups, 12 vervets (Chlorocebus pygerythrus) in five groups, and four leopards (Panthera pardus) that were trapped and fitted with collars holding Global Positioning System (GPS) devices programmed to take synchronized readings every 15 minutes over 14 months in Laikipia, Kenya. We found that higher encounter rates, smaller body and group size, and greater distance from refuges did not increase vulnerability to leopard predation. Overall, neither species was more vulnerable than the other. However, encounter initiation, rate, timing, and duration, the outcome of approaches, and predation events revealed a diel pattern of differential interspecific vulnerability: baboons were more vulnerable at night whereas vervets were more vulnerable during the day. As leopards are characterized as nocturnal hunters, the daytime vulnerability of vervets was surprising. Indeed, few of our results would have been predicted beforehand, suggesting that we have much more to learn about predator-primate relationships. Supported by NSF, Wenner-Gren, Leakey Foundation, JSPS KEKENHI, and UC Davis.